Automatic telephone system



NOV, 1, 1932. w, HATTON 1,836,097

AUTOMATIC TELEPHONE SYSTEM Filed Sept. 20, 1930' 9 Sheets-Sheet 1 FIG. 4-C

INV ENTOR WILLIAM HATTON ATTORNEY Nov: 1, 1932 w. HATTON Lgggag? AUTUMATIC TELEPHONE SYSTEM Filed Sept 20, 1950 9 Streets-Sheet 2 INVENTOR WILLIAM HATTON W ATTORNEY NW.- 1, 71932 H ATTQN 1,886,097

AUTOMATIC TELEPHONE SYSTEM.

Filed Sept. 20, i950 9 ShetS-Sheet s lNVENTOR WILUAM HATTON WGEW ATTORNEY Nov. 1, 1932. w. HATTON 1,836,097

AUTOMATIC TELEPHONE SYSTEM Filed Sept. 20, 19:50 9 sheets-sheet 4 FIG. 3A

INVENTOR WILLiAM HATTON Nov. 1, 1932. w. HATTON 1,886,097

AUTOMATIC TELEPHONE SYSTEM Filed Sept. 20, 1930 9 Sheets-Sheet 5 UBUBUUUUUR 1H- INVENTOR v WILLIAM HATTON ATTORNEY v Nov. 1, 1932. w. HATTON 6,

AUTOMATIC TELEPHONE SYSTEM Filed Sept. 20, 1930' 9 Sheets-Sheet 6 FIG.4-A

INVENTOR WILLIAM HATTON ATT fi y Nov. 1, 1932. w. HATTON 1,886,097

AUTOMATIC TELEPHONE;- SYSTEM Filed Sept. '20, 19:50 9 Sheets-Sheet 7 no.4 -B- n n n n u c: a: u 12': t: n

INVENTOR WILLIAM HATTON ATTORNEY Nov. 1, 1932-. w. HATTON AUTOMATIC TELEPHONE SYSTEM Filed Sept. 20, 1950 9 Sheets-Sheet 8 INVENTOR WILLIAM HATTON BY J:

MEN

932.. w. HATTON 1,886,097

AUTOMATIC TELEPHONE SYSTEM Filed Sept. 20, 1930 9 Sheets-Sheet 9 INVENTOR WILLIAM HATTON ATTORN EY Patented Nov. 1, 1932 UNITED STATES PATENT orsice WILLIAM HATTON, OF ANTWERP, BELGIUM, ASSIGNOR '10 INTER-NATIONAL STANDARD ELECTRIC CORPORATION, OF NEW YORK, N. Y., A CORPORATION OF DELAW'ARE AUTOMATIC TELEPHONE SYSTEM Application filed September 20, 1930, Serial No.

' This invention relates to automatic or semiautomatic telephone systems, and is more particularly concerned with telephone networks comprising main and satellite exchanges, in

which for calls originating in a satellite, a

junction to the main exchange is automatically taken into use.

There are two known types of satellite arrangements. In one of these the subscribers at the satellite are provided with impulse sending devices and both local and outgoing calls are made automatically, discrimination taking place either at the satellite or at the main exchange. In the second type the junction to the main exchange terminates at an operators position and all the calls both local and outgoing are completed by the operator. In both cases" the junction is released for a local call.

The present invention relates to a modification of the first arrangement. It has been proposed in certain full automatic networks of this type to provide zone metering throughout the system. It has been found inconvenient, however, to install such a system completelyin certain instances and in such instances it has been found convenient that calls between various exchanges of the net work or between certain of these exchanges should be semiautomatically completed by the aid of an operator at the main exchange. In such a case metering records would be taken by the operator. 7

According to one feature of the invention local calls within the satellite are completed automatically while calls outgoing therefrom are routed over a junction to an operators position at the main exchange. A satellite subscriber will, therefore be provided with an impulse sending device and discrimination must take place in accordance with the number dialled as to whether the call is local or outgoing. Since the operator is not required if the call is local, it will be inconvenient to signal the operator immediately the junction is taken into use, that is before dialling has commenced and therefore before discrimina- 7 tion has taken place.

In accordance with another feature of t e invention therefore, in a telephone network 483,233, and in Great Britain October 16, 1929.

comprising a main and a satellite exchange, on the initiation of a call at the satellite ex change, 'a junction to the main exchange is automatically taken into use, terminating at an operators position but the operator is not called unless the call is outgoing from the satellite.

According to a further feature of the invention if the call is local to the satellite the junction is released unused.

Other features of the invention will be apparent from the following description of one embodiment of the invention and will beset out in the statement of claim.

A general description will now be given of a layout shown in Fig. 1 of the accompanying drawings of theembodiment of the inventionto be described in detail later. The network to be described has a at digit numbering scheme. I I

In this embodiment a main or centre exchange C is shown having connected thereto a single satellite exchange TS. This satellite is of the tandem type and has connected thereto another exchange S. It will, of course, be obvious that more than one satellite may be connected to the main exchange and that more than one exchange S maybe connected to the tandem satellite TS. It will be obvious that all calls originating in the tandem group, that is in any one of the exchanges TS and S, proceed exactly as if they originated in TS. A toll position TP'is provided at the main exchange and all calls between G and TS in both directions will pass therethrough. Toll calls from any part of the network will also be handled at this position. When a subscribed BS in TS or S calls he will be automatical y connected via a link circuit L, an outgoing junction circuit OJ C,

and a both-way junction circuit BWJC to a tion but no signal is at present made thereto. The subscriber dials into register MCC. In the example shown in which the total capacity of the satellite group is 100 lines discrimination takes place after two digits and if the call is found to be local, the junction and the register are released and the last two digits operate the final finder switch of the satellite. If, however, the call is outgoing, release will not take place after two digits and two further digits will be received by the register. ihe magnitude of the digits is not recorded but switching operations take place on the reception of each digit. These switching operations indicate that the call is outg'omg and the signal is then sent over the junction to the operators position to light a lam CL. The operator will enquire the wante number and will complete the call automatically over the multiple M. When a call is originated in the main exchange C the subscriber is connected over the first and second line finders, lLF, 2LF, to a link circuit to which a register-sender RG becomes attached. The subscriber dials into the register and the register then sends out trains of impulses in the usual way. If the call is local to the main exchange, the call is set up over automatic switches as usual. If, however, the call is outgoing either for a call within the network or a toll call the call would be routed over one or two group finders, such as at 1GF, QGFS to a network recording jack NR or a toll recording jack TB at the toll position. These pieces are reached by a less number of digits than normally and it is necessary to provide some means whereby the register will be released and the connection switched through. These operations normally take place when the full number of digits have been sent out from the register. Instead of providing digit absorbing arrangements or the like, a signal is sent back immediately the toll position is reached, whereby switching operations take place to release the register and switch through the connection. Without further loss of time. The operator will complete calls within the network over the multiple M as before. As has been stated the selecting stages are of the finder type with control circuits CO. The operator at TP is provided with cords TC comprising dials D. Toll lines TL are also incoming to the position.

It is considered suflicient to illustrate the invention by describing (1) The initiation of a call from a satellite subscriber BS in TS, the method of discrimination between local and outgoing calls, and the means for signalling the operator.

(2) The setting up of a call from a main exchange subscriber OS to a 'ack NR at TP.

These calis will be descri d with reference to Figs. 2--A to 5-13 of the accompanying drawings. Figs. 2-A and 2-13 show a subscribers line and starting circuit at the satellite exchange together with a link circuit comprising a line finder SMF and one or two final finders SMS, together with a control switch SM. Each final finder is a single motion switch having access to a maximum of 50 lines. When a link circuit is taken into use one of the finders hunts automatically for an idle outgoing junction connected in its banks. If a call is found to be for a local call the junction is released and one or other of the final finders is set to the wanted line in accordance with the last two digits dialled.

Fig. 3A and 3-B comprises an outgoing junction circuit OJ C with its associated register MCC and also the both-way junction circuit BWJC and the jack RL and TP.

Fig. 4A shows the second line finder circuit at the main exchange.

Figs. 5A and 5B show the register sender at the main exchange associated with the second line finder.

Figs. 4*A and i -B show the first group finder of the singlemotion type with its control circuit, indicates the second group finder similar in arrangement to the first group finder, and shows also the recording trunk circuit and the jack NR at the toll position.

Figs. 2A and 2-B with Fi s. 3A and 3--E show the circuits for the first arrangement and should be arranged with Figs. 3A and 3B to the right of Fig. 2-13- and Fig. 3B below Fig. 3-A.

Figs. 4A, 5-A, 5-B, 4B and 4C show the second circuit arrangement and should be arranged with Figs. 4-B and 4C to the ri ht of Fig. 4-A, Fig. 5- A below Fig. 4 and Fig. 5B below Fig. 5-A.

Referring now to Figs. 2A, 2B, 3A and 3-13. When a subscriber at the satellite exchange lifts his receiver relay L1 operates, and at its front contacts operates the common starting circuit relays Lsr, Str, and circuits are closed for the stepping magnets of the idle call finders in the local link circuits: battery, SMF and its interrupter contacts, front contact of Sir, Ltl, normal contact of magnets SMS, A4, wiper Sml, E3, M03 earth.

When the call finder finds the calling linerelay Lt operates, earth, upper winding of Lt, BJ, wiper e of SMF to battery on front contact of Lr. SMF is stopped and relay A now operates; battery, via thermostat contact TH, A, Ltl, normal contact of SMS to earth as above for magnet SMF.

SMS now hunts for a free outgoing junction; battery SMS and interrupter contact A2, T04, J t1, earth.

Test relay J 25 operates on an idle junction to stop hunting, earth A1, wiper s'mse, Jt, wiper Wi l and normal contact, wiper smsc, Dr), Thr, via back contacts of the line and cut-off relays of the incoming junction circuit Lc1'3 to battery; relay D 1 of the junction. Lt is held by earth on A3 and in turn holds A.

When the outgoing junction is seized, relay I81 operates over. the calling loop, followed. by L61 and Ar in obvious circuits. Relay Dr now operates via an and locks to D 1 1. The battery pot ntial operating J is maintained at A1 1 when D1 2 opens. Ground at 1W2 is connected via are, B1 1, C1 3, the j unction B wire, 511 252, AJ, Asst to battery. Re lays Arr-t, Brt, A1 6 operate in turn. The operation of relay Ar in the OJC also connects battery over E1 1, A1 2 so that the common start relays Si'rm, (11 m of the register circuit BC operate. The finder switch SMF now hunts for the calling junction; SMF and its interrupter contacts, front contacts of Crm,

5251 1121, earth. When the junction is reached Jtrm operates from the battery traced above over wiper a, left hand winding of Jtrm, normal contact of SMT,normal contact and wiper as, A11'nl to earth. Arm then operates from earth at Jtrml, and connects earth to the low resistance right hand winding of 5251 -111, to busy the junction. A circuit is formed from battery, E1" in OJC, C 1", wiper c, Arm l, normal contact and wiper Z58, Lmrml, Arms), earth. Relay C 1 only operates and closes a circuit; battery, C1", 0 13, Isrl, earth.

Dial tone is now connected up from the manual incoming junction circuit; the tone is connected from lead DT, Bsrtl, Art to a coil from which it is induced in other coils connected to both junction wires. Dialled impulses are received by 187 which repeats them at its contact 1 over wiper b, A1 m3,

locks up.

171111 111., CmqmQ, Cnrm SM to battery. Switch SM steps on at each impulse and Lmrm energizes throughout the digit and releases relays C 1 C1" in O. J. C. so that dial tone is disconnected. Slow release relay BM in the manual circuit prevents interference by dialling. Directly Sl/l steps, oil-normal switch SMT begins to hunt for the group of terminals marked by wiper es; battery SMT and its interrupter contacts as, Lt1 1n2, Carma, A1'1n5 to earth. When SMT finds the marked contact, relay Ltrm operates via Gmqml, ct, es, battery, and with Lmrm released and Ltrm operated, 011mm energizes; battery Cnrm Carma, Lzrml, be, Lmrml, A1 1115, earth and The neXt digit is therefore repeated direct to 8M via 0111 112 Ltrm releases and at the expiration of the digit, relay 01mm operates; battery 0121 112, Cmqmd, 0121 1123, Lz'rml to AT17Z5 as above; and locks up. On the next digit being dialled, Lmrm again operates to battery via cmgmZ so that relay Dcr m operates; Dcr m, Dar m2, Dam met, Cnr 1n3, Lmrml, A11n5, earth. Dcr m locks via Dcr m2, DQ151122, A1 5, at the end of the digit. At the next digit, Damn operates and locks up similarly releasing Dor m. If the first digit was even, relay E61 operates, via (18 Carma, Arm5.

Local call If, however, the call is a local one, earth is connected after SMT is set from A1 5, Car m4, Etrl, at (or Zn) jumpering point, Mar m, L01", to battery. Morm operates and connects relay Lc1- in parallel to itself at Mcrml. Test battery is disconnected at Lori) so that relay Jt (Fig. 2B) in the link circuit releases, followed by M0 (Fig. 2-A). Relay As (Fig. 2A) of the local transmission bridge operates. The junction is disconnected so that the outgoing junction circuit, the register circuit and the manual junction circuit releases; The last two digits then operate in the link circuit to complete the local connection.

Outgoing call For an out oing call, the normal lt-digit number of tie wanted subscriber is dialled. Since the very fact that more than two digits are received in M00 is conclusive that the call is outgoing, no jumpering via SMT is necessary, but after the fourth digit has been dialled and Dcr m is operated, a circuit is formed from battery E1" in OJG, C 1", c,A1"111.4, Dcr ml, Dc1 m ,L1n1"m Arr/i5, to earth. E1" operates in this circuit, connecting battery via relay C5 1", B14, E14, A1 3, to the A wire of the junction thereby operating relay Bsrt via AJ, and A1752. Lamp CL is now lighted to warn the operator of an incoming call.

Relay J 61 in MCC releases, so that MUG returns to normal.

On plugging in, all the incoming junction relays are released, but battery potential designating an idle junction which was pre viously cut oft at AMA, is still disconnected at AJ.

For special service two digit numbers are allocated, the first digit being 0. After the second digit has been dialled, relay E1" in 050 is operated from earth via A11n5, (Imam-l, wiper fs and its tenth contact, Arm l and wiper c.

If discrimination is to take place after the firstdigit, the points a should be connected so that earth is connected to wiper at or bi via cu1 1n2, 1t1=1n3 jumpering point a, etrl, to operate Mama after the first digit if the call is local. In this case, 0 only would be dialled for special calls and E1" would be operated from the earth referred to above via a and wiper fs.

An outgoing call from the main exchange will now be described with reference to Figs.

Ill

4 A, 5A, 4'B and 4C, which should be arranged with Fig. 4-B to the right of Fig. 4A and Fig. 5A below Fig. 4A.

Ground from the line finder starting circuit operates the finder magnet PL in a circuit via BJ, A1 1, Fr3, Gr1,Dr4,PL to battery. On reaching the calling 1st line finder, relay Ar operates via wiper (l, BJ, left hand winding of Ar, to the starting circuit. C? operates from ground on the start wire, A9 1, left hand winding of Cr, Dr?) to battery. Ar is now held from earth on 071 via its low resistance winding which busies the 1st line finder. Relay Br now operates via CrS, Arl,

. to start lead, and in turn closes a circuit from earth via Brl Gr for relay Dr so that relay Hr energizes in series with the calling subscribers cut-ofi' relay via Dr3 over wiper a. Supervisory relay Sr energizes over the subscribers loop and contacts Drl, D1 2. 7

Relay Cr locks up via Cr-l, I l r3, Dr5 to battery and Br remains energized via Hi2, Srl. Battery via D'r5, C1 2, energizes relay Str which closes a circuit for Ger, and the free registers start hunting for the calling line finder circuit, in circuits such as battery PR, T012, Carl, Rtrl, LJ, BK to earth. The test relay Btu" of the first register to reach the calling trunk energizes in a circuit; battery Dr5, GT2, wiper g, high resistance left hand winding of Rtr, L73, normal contact and wiper c of switch SMA, R 11 to earth, PR1 is released and relay Tc r energizes via Rtr LJ and RK to earth, busying the trunk circuit by connecting earth via low resistance winding of Rtr to wiper 9. Relay Tor then operates in an obvious circuit and connects up dial tone coil DTC to transmit a tone to the calling line from its right hand winding via Tara"), wiper a, 1W6, to the a wire, and via T016, T014, wiper b, Frl to the 2) wire. Relay Rbr operates; battery Rbr, interrupter contact of switch SMA, wiper a of switch SMA and contact Tor to earth, and energizes magnet SMA which releases Rbr and steps to its first contacts when Rb'r again energizes to earth on second contact of wiper a of switch SMA and SMA steps to its second contact. The digit impulses are repeated at Srl via wiper 0, Tort), to relays Is), S11 in series, and 151* repeats these in turn to register switch SMTH in a circuit; earth R 13, Pgr6, Isrl, wiper d of switch SMA, magnet SMTH to battery. Relay S19 remains encrgized during the digit and energizes .llbr which locks up via interrupter contacts of SMA. and Rbrl. A circuit is now formed from battery on D1 5 of the line tinder circuit, lower winding of Er, wiper (Z, winding of C, R674, Wiper c of switch SMA, 751 to earth. Relays Er and C energize and the former disconnects dial tone and releases relay C r. Test potential is removed and relay R1 1" 'releases but relay Tc r holds in a circuit via C1, LJ, BK to earth, and in turn maintains T01- operated.

At the end of the digit, Slr releases so that SMA operates via Rbr3,'S1r1, releases Rbr and steps to its second contacts.

The remaining digits are similarly received on SMH, SMT and SMU, SMA stepping on between each digit.

When SMA is on its fourth contacts after two digits had been received relay Tar opg'ates via wiper 0 of switch SMA to earth on Earth is now connected via relay B, Tar-3, T01 5, Wiper a, F1 6, to the a wire; and battery is connected from Ta1'4, home contact and wiper X of impulse sending switch PI, T014, wiper 0, Fri, C1'5 to the 6 wire.

Relay Am in the control circuit of the first group finder operates via J 7 1 in the finder circuit, JQI'Q and the b wire. E02 energizes, so that switch SMB hunts in a circuit; bat tery, SMB, interrupter contact, Earl, Bcrl, Fcr3, to earth. hen the calling trunk is reached, test relay Ber energizes in a circuit via Gc r3, wiper 0b to the Z) wire as above. Relays For in the control circuit and J 1' in the finder circuit now operatein series; For, J 1, wipper 66, B021, Fort to earth, and lock via J92, JiZrl and B11 in the line tinder circuit. Switch SMB now returns to normal in a circuit; SMB and its interrupter contact Gem), FcrQ, off-normal are and wiper (lb, to earth. Belay B01- releases and Gar operates from earth on wiper db. A loop is now formed from the register via the a wire J 74, relay Bra, G012, J rl, J r2 to the 6 wire. Relay B in the register operates. Relay B energizes Lr in an obvious circuit. L7" short circuits B at LrQ, and locks via wiper Y of PI, Izr-P. Relay Bra in the control circuit now operates. The impulse sending switch now begins to rotate; battery PI, Lrl, D27 2 to earth.

At each step of PI, Bra is impulsed, and steps switch SMB in a circuit; battery, SMB, Ira, Gog-1, Gcrl, Bral, earth. After the required number of impulses have been sent out, relay Nir operates via D 14, wiper b of switch SMTH and the contact on which it stands, the contact of wiper Z of PI. connected thereto, wiper Z to earth. Belay Nivshort-circuits the impulsing wiper X at N'z'rl, and locks up via Pgrl, NW2, L7'6 to earth. lVhen the control switch SMB left its home contacts the energizing circuit for Ger was opened, but this relay was held via Iral,

.F 013 until the end of the digit when it releases and opens the forward loop.

VVhe-n PI reaches contact 13 relay D r operates via wiper Z and locks Via D173 and T0 73. When wiper Y leaves its oil-normal arc, relays L1 and Nir release, and PI stops.

lV1th G0 1" operated and Gcr released, a circuit is formed from earth on Gc rti, over G0r3, Hcrl, J r3, PJ, to battery, and the group finder hunts for an idle contact marked by the control switch. When an idle marked contact is reached, test relay H09" operates; earth, F01 3, left hand high resistance winding of H01", Gc rl, wiper ab, wiper (Zj, J r5, wiper cj, Brrl, to battery. Her locks in se ries with Scr which also operates. PJ is disconnected. R-elay J operates; battery S02 J 1", J r2, J rl, Brl in the line finder circuit to earth. Relay J 7" is released at J 7' to disconnect the control circuit and J 7 locks via J 7' and Brl. J 1" connects the speaking'conductors through to the second group finder. The second group finder control circuit operatlons are identical with those of the first group finder control circuit, and the second digit is sent out as before under control of SMH, since the circuit for Nir is now via Pgr D 1 4, D r to wiper Z) in switch SMTH. At the end of the digit, the second group finder finds a toll recording trunk and the register relay D 9" operates via contact 12 of wiper Z and D 72. The group finder finds battery via Brrl on the 0 wiper. Relay Dr? of the toll recording trunk operates from the battery and earth over the a and Z9 wires from the register and energizes relay Arr which puts earth on the fourth wire. A calling lamp CL is lighted.

Earth on the fourth wire is connected back through the group finder circuits to operate relay G1" in the second line finder circuit. Relay Gr releases I)? at GT4: and Dr releases E1", Cr, T0 1" and T01" in the register. Rr now operates via ofi-normal bank of wiper b of switch SMA, C LJ, BK to earth and energizes R 1. SMTH now homes; earth, interrupter contacts of register magnets, R 77 oil-normal arc and wiper a of switch SMTH, SMTH to battery; the other registers in turn home, after which the circuit is transferred to relay B61" via the normal contacts of all the register a wipers and wiper a of switch SMA, so that SMA in turn homes.

Relay Gr also connects the a and 6 leads through in a metallic circuit at GT5, G1 3.

Relay Drr in the recording circuit holds over the junction until the operator plugs in when relay BM operates to disconnect CL and DH, and holds Arr. The calling subscriber is fed from the operators cord.

What is claimed is:

1. In a telephone exchange system the combination of a main exchange and a satellite exchange, an operators position, automatic switching mechanism at each exchange provided with banks, a junction line extending from the satellite exchange to the main exc -ange terminating in two branches, one leading to the operators position and the other leading to the banks, and means whereby calls can be extended over each branch.

2. In a telephone exchange system the combination of a main exchange and a satellite exchange, means for originating calls at each exchange, a register sender at the main exchange, an operators position at the main exchange, means controlled by calls originated in the main exchange for connecting with said register sender, and means controlled when a call is routed to said operators position to cause the release of said register sender.

3. A circuit arrangement for a telephone exchange system comprising a main exchange and a satellite exchange to which lines are connected, a junction line extending to the main exchange, means for initiating a call at the satellite exchange, an operators position, a register sender, and means for passing calls from the main to the satellite exchange through the operators position, said calls comprising potential placed on one of the wires of the trunk and a relay connected to said register sender whereby the register sender is disconnected from the circuit and the talking conductors of the trunk are switched through.

l A circuit arrangement for a telephone exchange system comprising a main exchange, a plurality of satellite exchanges of the tandem type to which lines are connected and discriminating means adapted to discriminate for all calls originating in the tandem group as if all the subscribers were located in the tandem satellite.

5. A telephone exchange system comprising a main exchange and a satellite exchange, an operators position and a selector stage wherein there are two-way junctions each junction terminating at the main exchange in two branches, one incoming to the operators position and the other outgoing from the banks of the selector stage, both branches adapted to be made busy at the main exchange when a junction is taken into use at the satellite exchange.

6. A telephone exchange system comprising a main exchange with register and a satellite exchange wherein the satellite exchange is of the tandem type having a plurality of satellites connected thereto, means for discriminating after two digits of a call to release the junction and register if the call be local and to permit operation of the final finder switch of the satellite by the last two digits.

7. A telephone exchange system comprising a main exchange and a satellite exchange of the tandem type to which lines are con nected and having satellites connected there to, a junction line extending to the main exchange and means for discriminating after reception of each digit if the call be outgoing.

In witness whereof, I hereunto subscribe my name.

WILLIAM HATTON. 

